细分散B_4C颗粒对Si_3N_4陶瓷的增强与增韧效应  

Effects of Finely Dispersed B_4C on the Strength and Toughness of Si_3N_4 Ceramics

作　　者：邓斌[1] 侯耀永[2] 

机构地区：[1]湘南学院化学系,湖南郴州423000 [2]青岛科技大学应用化学系,山东青岛266042

出　　处：《郴州师范高等专科学校学报》2003年第5期70-73,共4页Journal of Chenzhou Teachers College

基　　金：郴州师范高等专科学校2001年度科研立项课题

摘　　要：本文通过对不同B4C含量的Si3N4陶瓷的力学性能研究,探讨了B4C相变对Si3N4陶瓷的强度和韧度的影响,分析了各种增强与增韧的机制,并用能量平衡理论讨论了强度和韧度增加的原因.结果表明,利用应力诱导相变效应,可以有效地提高Si3N4陶瓷的弯曲强度和断裂韧度.The effects of B_4C transformation on the strength and toughness of Si_3N_4 ceramics were studied based on the mechanical properties and microstructure of Si_3N_4 ceramics containing 0-30wt% of B_4C.The strengthening and toughening mechanisms were also discussed by means of several strengthening and toughening models,and toughness of energy-balance theory.Results show that the bending strength and toughness of Si_3N_4 ceramics can be effectively increased by the aid of B_4C transformation.

关 键 词：SI3N4陶瓷 B4C颗粒 力学性能 能量平衡理论 应力诱导相变效应 弯曲强度 断裂韧度 

分 类 号：TQ174.15[化学工程—陶瓷工业]